Land Rover Garage - LAND ROVER ENGINE SPECIALISTS
Land Rover technician rebuilding an engine block

Land Rover Discovery P400e Engine Rebuild - From £2,800

Specialist Land Rover Discovery P400e engine rebuilds and replacements, with registration-based engine matching, nationwide recovery and a 12-month unlimited-mileage warranty

Rated Land Rover Engine Specialists - 1,800+ Engines Rebuilt

Specialist technicians with 10-15 years of experience

12 Month Unlimited-Mileage Warranty

Nationwide Recovery

Free Engine Matching by Registration

Ingenium Ingenium AJ300P Specialists

GB

Your Land Rover Discovery P400e Engine

Land Rover turbocharged engine

Vehicle

Land Rover Discovery P400e

Model

Discovery

Variant

Discovery P400e

Fuel

Petrol PHEV

Engine

Ingenium AJ300P

Capacity

3.0L I6

Generations

D5/L462 (2017-present)

Rebuild From

£2,800

?

Not sure which engine you have?

The Discovery P400e uses the Ingenium AJ300P 3.0-litre inline-six mild-hybrid engine - enter your registration below and we'll confirm your exact spec before you get a quote.

GB

DVLA & VIN verified

100% secure & private

No obligation quote

Land Rover Discovery P400e Engine Rebuild Price

Starting From £2,800

Ingenium AJ300P engine

Engine Code

Ingenium AJ300P

Rebuild From

£2,800

D5/L462 (2017-present)

Generation

D5/L462 (2017-present)

Exact price depends on condition and parts required - submit your reg for a fixed-price quote.

Get Your Fixed-Price Quote

Land Rover Discovery P400e Known Issues by Engine

If your Discovery P400e has the Ingenium AJ300P (L663 generation):

Timing chain wear - Ingenium diesel engines share a well-documented timing chain pattern. We replace timing chains, guides and tensioners as standard on every Ingenium AJ300P rebuild.

Source: established specialist consensus, l663.guide specialist buying guide, what-breaks.com. This applies to L663 Defenders only - not to classic Defender models

Land Rover engine block

Land Rover Discovery P400e ENGINE OPTIONS

Every Discovery P400e is different. That's why we offer the right solution for your engine, your car and your budget.

01MOST POPULAR

REBUILDING YOUR DISCOVERY P400E ENGINE

Most engine suppliers sell you a used engine of unknown history and hope it matches. We rebuild the engine your Discovery P400e already has instead - strip it down, pressure-test it, and replace every worn or damaged component (timing chain, injector seals, bearings, gaskets, DC-DC converter) with updated OEM parts. You get a near-new engine with a 12-month unlimited-mileage warranty, without the compatibility risk of an unknown used unit. This is the option most Discovery P400e owners choose, and it's the one we'd recommend for most situations.

From £2,800
02

RECONDITIONED DISCOVERY P400E ENGINES

"Reconditioned" is the term many owners search for when they mean the same thing as a rebuild - a full strip-down, inspection, and replacement of worn parts rather than a straight swap. If that's what you're after, our rebuild service is exactly that.

Learn more
03

REFURBISHED DISCOVERY P400E ENGINES

Similarly, "refurbished" often describes the same process from a different angle - restoring your existing engine to full working condition rather than replacing it outright. Our rebuild covers this.

Learn more
04

REMANUFACTURED DISCOVERY P400E ENGINES

Some owners specifically search for a "remanufactured" engine, expecting a unit rebuilt to original specification with updated components. That's consistent with what our rebuild service delivers on the Ingenium AJ300P.

Learn more
05

REPLACEMENT DISCOVERY P400E ENGINES

If your existing engine is beyond economical repair, we also offer full engine replacement and fitting - sourced and fitted by our team, with the same 12-month warranty.

Learn more
06

USED DISCOVERY P400E ENGINES

In some cases, a matched low-mileage used engine is the right call - particularly if you need your car back on the road quickly and your existing engine's damage is extensive. We can source and fit these too, though most owners who ask about used engines end up choosing a rebuild once they understand the compatibility risk a used unit carries. Enter your reg below and we'll talk you through both options honestly.

Learn more

NOT SURE WHICH OPTION IS RIGHT FOR YOU?

Enter your registration below and we'll confirm your Ingenium AJ300P and talk you through the best solution for your Discovery P400e, honestly.

Ask About Your Options

OUR WORKSHOP

RECOVERY COLLECTION01

RECOVERY COLLECTION

Ingenium AJ300P ENGINE STRIPPED FOR REBUILD INSPECTION02

Ingenium AJ300P ENGINE STRIPPED FOR REBUILD INSPECTION

VALVE COVERS & COOLANT COMPONENT WORK03

VALVE COVERS & COOLANT COMPONENT WORK

TECHNICIANS AT WORK04

TECHNICIANS AT WORK

ENGINE TESTING (RIG)05

ENGINE TESTING (RIG)

COMPLETED & READY FOR REFIT06

COMPLETED & READY FOR REFIT

Real photos from our workshop - not stock imagery. This is what a genuine Land Rover Discovery P400e rebuild looks like.

Land Rover Discovery P400e ENGINE REBUILD PROCESS

1Diagnosis

We confirm your exact engine code and assess the damage.

2Removal

Your engine is removed and brought into our workshop.

3Strip-Down

Every component is removed for individual inspection.

4Inspection

Crankshaft, cylinder head, timing chain, bearings, water pump and gaskets are all checked.

5Machine Work

Any machining required is carried out to OEM tolerances.

6Component Replacement

Worn or damaged parts are replaced with updated OEM components.

7Reassembly

Your engine is rebuilt to original specification.

8Testing

Every rebuild is pressure-tested before refit.

9Refit

Your engine goes back into your Discovery P400e.

10Road Test

A full road test confirms everything's right before we hand your car back.

WHAT LAND ROVER Discovery P400e OWNERS SAY

Daniel R.

“Brilliant service from start to finish. My Discovery P400e runs smoother than ever. Honest advice, clear pricing and the team know their stuff.”

Land Rover Discovery P400e Engine Rebuild

Mark T.

“They rebuilt my Ingenium AJ300P with all the updated parts. Smooth process and great communication throughout.”

Land Rover Discovery P400e Engine Rebuild

Ryan P.

“Top lads, top job. Picked up and dropped off, engine rebuilt to an extremely high standard. 100% recommend.”

Land Rover Discovery P400e Engine Rebuild

Steve B.

“Saved me thousands compared to a dealer quote. Fantastic workmanship and my Discovery P400e is running perfectly.”

Land Rover Discovery P400e Engine Rebuild

Tom H.

“From quote to collection couldn't fault them. Engine looks brand new inside. Warranty gives great peace of mind.”

Land Rover Discovery P400e Engine Rebuild

James K.

“Professional, reliable and fairly priced. Sorted properly and kept me updated throughout.”

Land Rover Discovery P400e Engine Rebuild

WE COVER YOUR EXACT VEHICLE

Enter your registration below and we'll confirm your Land Rover Discovery P400e has the Ingenium AJ300P, along with an exact rebuild price.

GB
FastAccurateNo Guesswork

WHY LAND ROVER Discovery P400e OWNERS CHOOSE US

Engine matched using VIN or registration number

Genuine specialist workshop - not a broker

Specialist technicians with 10-15 years of experience

We don't swap your engine for an unknown used unit

Nationwide recovery, workshop rebuild

12 month unlimited-mileage warranty

All engine ancillaries serviced as part of the rebuild

Trade & public enquiries welcome

Dedicated advisor from quote to fit

OUR MOST RECENT LAND ROVER RECOVERIES & REBUILDS

Real vehicles brought into our workshop. Open bonnets, stripped blocks, and cars ready for collection - this is what genuine engine work looks like.

Land Rover Discovery P400e

Land Rover Discovery P400e

RECOVERY

Land Rover Discovery P400e

Land Rover Discovery P400e

DIAGNOSTICS

Land Rover Discovery P400e

Land Rover Discovery P400e

STRIPPED ENGINE

Land Rover Discovery P400e

Land Rover Discovery P400e

TIMING CHAIN REPLACEMENT

Land Rover Discovery P400e

Land Rover Discovery P400e

IN FOR REBUILD

Land Rover Discovery P400e

Land Rover Discovery P400e

REBUILD IN PROGRESS

HOW IT WORKS

1

SEND YOURREGISTRATION

2

RECEIVE YOURFIXED-PRICE QUOTE

3

WE RECOVERYOUR CAR

4

REBUILD &REFIT

Most Defender models are recovered within a few hours of booking. Most rebuilds are completed within 3-5 working days.

Workshop slots fill up fast - book your recovery today.

LOOKING FOR A USED OR REPLACEMENT ENGINE INSTEAD?

We supply low-mileage, VIN-matched used units too, and offer full replacement and fitting. However, most Discovery P400e owners choose a rebuild once they realise it removes compatibility risk and works out more cost-effective over the life of the car. Enter your reg below and we'll show you every option, honestly.

Ask About Used Engine Options

ABOUT THE Land Rover Discovery P400e ENGINE

Land Rover engine and vehicle

The Discovery P400e is a plug-in hybrid variant of the current D5 generation, introduced in 2017. It uses the Ingenium AJ300P - a 3.0-litre inline-six petrol engine paired with an electric motor and battery. It is one of the few petrol options in the Discovery range, sitting alongside the diesel D250/D300/D350 and the petrol P360/P400. The P400e's powertrain is shared with other JLR models, and its petrol engine is known to be generally more reliable than its diesel Ingenium counterparts.

We continue to rebuild and replace Ingenium AJ300P engines for every Discovery P400e on the road.

Land Rover Discovery P400e ENGINE CODES

A 3.0-litre inline-six petrol fitted to the Discovery P400e from 2017 to present (D5/L462). This is the petrol PHEV engine for the Discovery range. There are no widely-reported known issues specifically for this engine in this application.

Check Your Ingenium AJ300P Discovery P400e

Land Rover Discovery P400e ENGINE COMPATIBILITY

Land Rover Land Rover vehicle in workshop

Because the Discovery D5 shares the same AJ300P engine with other variants like the P400, and the range also uses different engines for diesel models (AJ300D) and the P360, it's critical to confirm your exact engine code before any work is carried out. Sourcing the wrong engine or assuming the same parts fit across the range can lead to compatibility issues. We always start with your registration to verify your Discovery P400e's exact engine code.

Your exact engine code (Ingenium AJ300P) via registration or VIN

Your generation (L663)

Drivetrain and ancillary specification

Whether your build falls in the early production period (2019-2020) for injector fault coverage

This is why we always start with your registration rather than a generic Defender quote - it protects you from paying for parts that don't fit your actual car.

Land Rover Discovery P400e APPLICATIONS BY GENERATION

Generation

Chassis

Years

Engine Code

Fuel

D5

D5

L462

2017-present

Ingenium AJ300P

Petrol PHEV

Land Rover Discovery P400e ENGINES BY YEAR

Land Rover Discovery P400e has used the Ingenium AJ300P throughout. If you're unsure of your exact spec, we'll confirm it before you book.

Year

Generation

Engine Code

Fuel

Service

2017

D5/L462

Ingenium AJ300P

Petrol PHEV

Rebuild / Replacement

2018

D5/L462

Ingenium AJ300P

Petrol PHEV

Rebuild / Replacement

2019

D5/L462

Ingenium AJ300P

Petrol PHEV

Rebuild / Replacement

2020

D5/L462

Ingenium AJ300P

Petrol PHEV

Rebuild / Replacement

2021

D5/L462

Ingenium AJ300P

Petrol PHEV

Rebuild / Replacement

2022

D5/L462

Ingenium AJ300P

Petrol PHEV

Rebuild / Replacement

2023

D5/L462

Ingenium AJ300P

Petrol PHEV

Rebuild / Replacement

2024

D5/L462

Ingenium AJ300P

Petrol PHEV

Rebuild / Replacement

2025

D5/L462

Ingenium AJ300P

Petrol PHEV

Rebuild / Replacement

2026

D5/L462

Ingenium AJ300P

Petrol PHEV

Rebuild / Replacement

i

The Ingenium AJ300P has been fitted to every Discovery P400e since launch - if your registration year isn't listed above, get in touch and we'll confirm availability directly against your reg.

WE COVER EVERY Land Rover Discovery P400e MODEL YEAR:

Land Rover Discovery P400e
2017 Engine Rebuild

Land Rover Discovery P400e
2018 Engine Rebuild

Land Rover Discovery P400e
2019 Engine Rebuild

Land Rover Discovery P400e
2020 Engine Rebuild

Land Rover Discovery P400e
2021 Engine Rebuild

Land Rover Discovery P400e
2022 Engine Rebuild

Land Rover Discovery P400e
2023 Engine Rebuild

Land Rover Discovery P400e
2024 Engine Rebuild

Land Rover Discovery P400e
2025 Engine Rebuild

Land Rover Discovery P400e
2026 Engine Rebuild

If your registration year or model isn't listed above, get in touch - we'll confirm availability directly against your reg.

Land Rover Discovery P400e ENGINE COSTS

A Land Rover Discovery P400e engine rebuild starts from

£2,800

A full replacement engine and fitting service is also available. Exact pricing depends on the condition of your existing engine and the parts required - submit your registration for a fixed-price quote within 30 minutes.

Land Rover engine

12 MONTH

UNLIMITED-MILEAGE

WARRANTY

LAND ROVER Discovery P400e ENGINE SIZES

• Land Rover Discovery P400e 3.0 Litre Engine (Ingenium AJ300P, I6)

LAND ROVER Discovery P400e FUEL TYPES

• Land Rover Discovery P400e Petrol Mild Hybrid Engine Rebuilds

Most Land Rover Discovery P400e engine rebuilds are completed within 3-5 working days.

Nationwide recovery and collection available for all Land Rover Discovery P400e models.

Land Rover vehicle recovery and collection

FREQUENTLY ASKED QUESTIONS

Land Rover vehicle in a dark showroom

GET YOUR FREE LAND ROVER Discovery P400e FIXED-PRICE QUOTE

Most quotes returned within 30 minutes during working hours.